RadRichTextBox RtfFormatProvider Style of type Paragraph can not have linked style of type Paragraph

[Kamran]

I am converting HTML document to RTF by Telerik.Windows.Documents.Flow.FormatProviders.Rtf.RtfFormatProvider.

Conversion works fine, but When I am binding final RTF document to RadRichTextBox editor (RtfFormatProvider), It gives me following error

 

Style of type Paragraph can not have linked style of type Paragraph.

System.InvalidOperationException: Style of type Paragraph can not have linked style of type Paragraph. at Telerik.Windows.Documents.Model.Styles.StyleDefinition.CheckIsValidLinkedStyle(StyleDefinition linkedStyle) at Telerik.Windows.Documents.Model.Styles.StyleDefinition.set_LinkedStyle(StyleDefinition value) at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfStylesTable.InitializeRelatedStyles() at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfStylesTable.ReadTable(RtfGroup group, RtfImportContext context) at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfHandlers.RtfGroupHandlers.StylesTableHandler(RtfGroup group, RtfImportContext context) at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfDocumentImporter.DoVisitGroup(RtfGroup group) at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfElementIteratorBase.VisitElement(RtfElement element, Boolean recursive) at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfElementIteratorBase.VisitGroupChildren(RtfGroup group, Boolean recursive) at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfDocumentImporter.ImportRoot(RtfGroup rtfGroup) at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfDocumentImporter.Import(Stream input, RtfImportSettings settings) at Telerik.Windows.Documents.FormatProviders.Rtf.RtfFormatProvider.Import(Stream input) at Telerik.Windows.Documents.FormatProviders.Rtf.RtfFormatProvider.Import(String input)

 

For reference I am attaching sample project and html document.

 

We are facing lot of issue by such conversion. Sample Html document I shared is generated by Telerik Richtext box editor, but same document conversion is not working.

[Tanya]

Hi Kamran,

You can directly use the format providers of RadRichTextBox - Telerik.Windows.Documents.FormatProviders.Rtf.RtfFormatProvider and Telerik.Windows.Documents.FormatProviders.Html. The other ones (containing Flow in their name) are classes related to the WordsProcessing library. I am attaching a modified version of the code that uses the API of RadRichTextBox.

Hope this is helpful.

[Kamran]

Thanks Tanya,

The ServiceHelper.cs file I attached is extracted from Web API's class library, where I cannot use wpf RadRichTextBox libraries.

Is there any option to use Telerik.Windows.Documents.FormatProviders in .Net core web services.

[Tanya]

Hi Kamran,

The API of RadRichTextBox can be used in WPF applications only. .NET Core is also supported by the control but still requires the Windows Compatibility Pack.

Another option I could suggest is to remove the style that causes the issue:

// ...
document = htmlProvider.Import(content);
foreach (var style in document.StyleRepository.Styles)
{
    if (style.Name.Contains("Char"))
    {
        document.StyleRepository.Remove(style.Id);
    }
}

return rtfProvider.Export(document);
// ...

This way, you can still use the API of WordsProcessing and RadFlowDocument.

I have also logged a report for the cause of the error you are getting. You can subscribe to the related public item if you would like to receive notifications about status changes on it: WordsProcessing: Styles inside HTML document exported from RadRichTextBox for WPF is not properly imported.

Hope this is helpful.